PMID: 3768958Nov 7, 1986Paper

Mammalian multidrug resistance gene: complete cDNA sequence indicates strong homology to bacterial transport proteins

Cell
P GrosD Housman

Abstract

The complete nucleotide and primary structure (1276 amino acids) of a full length mdr cDNA capable of conferring a complete multidrug-resistant phenotype is presented. The deduced amino acid sequence suggests that mdr is a membrane glycoprotein which includes six pairs of transmembrane domains and a cluster of potentially N-linked glycosylation sites near the amino terminus. A striking feature of the protein is an internal duplication that includes approximately 500 amino acids. Each duplicated segment includes a consensus ATP-binding site. Amino acid homology is observed between the mdr gene and a series of bacterial transport genes. This strong homology suggests that a highly conserved functional unit involved in membrane transport is present in the mdr polypeptide. We propose that an energy-dependent transport mechanism is responsible for the multidrug-resistant phenotype.

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Citations

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